Well, your saturation index is now +0.06 or essentially perfect. When your CH was at 200, it was -0.32 which is slightly corrosive, but not so much as to cause the CH to rise as you saw it UNLESS the addition of acid kept the pH much lower or the acid pouring corroded the plaster where you poured, but this seems like a stretch. So this is a mystery unless someone figures it out.

Anyway, your pool is in good shape now though you can lower your TA to reduce the tendency of the pH to rise -- with the higher CH you now have, you can lower the TA with no problem (down to 80) using this procedure and can also make your pH target around 7.7. This should help reduce the pH rise and certainly the amount of acid you need to add. Adding the Borates will help even more.

Richard